Guides & how-tos

Free, practical how-to guides for working with video, images, PDFs, data and more — each one links to the browser-based tool that does the job.

• How to calculate video file size from bitrate and duration — The one formula that links file size, bitrate and duration — and how to solve for any of the three.
• What bitrate should you use for 1080p and 4K video? — Sensible export bitrates by resolution and frame rate, and why HEVC/AV1 need far less than H.264.
• How to scale a resolution by percentage (without half-pixels) — Scale a resolution by a percentage while keeping the ratio — and pick scales that stay on even pixels.
• How to make a vCard QR code to share your contact — Turn your contact details into a .vcf file and a scannable QR anyone can point a camera at.